Tesco Mobile Limited (trading as Tesco Mobile) is a mobile virtual network operator (MVNO) in the United Kingdom, Ireland, Slovakia, Hungary and Czech Republic. It is operated by Tesco, using the O2[3] network as its carrier except in Hungary, where the network operator is Vodafone.

On 30 January 2014, Tesco Mobile started offering 4G service for its Pay Monthly and Sim Only customers at no extra cost.[4][5]